Thermostatic valve.



Patvnted Sept. 3, 1918.

INVENTOR WITNESSES I i a citizen of the United States, and resident of Pittsburgh, in the county of Allegheny] and State of Pennsylvania, have invented Thermostatic Valves, of which the follow. ing is, aspecification.

UNITED STATES PATENT OFFICE.

--BOBEBT T, PABISEN, OF PITTSBURGH, PENNsYLvANlA, A SSIGNOB TO LAWSON MANUFACTURING COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORA- rron or rmsvnvanm 'rnnmros'rarrc vulva To all whom-it may comem: w

Be t k own that I, ROBERT T. PARISEN,

certain new and useful Improvements in he primaryobject is to provide a valve mechanism of simple-and improved construction for automatically controlhng the "flow of gas to a. water heater, the position of the valve being determined by the temperature of the. water being heated. The' invention includes a connecting means interposed between the valve and the thermo static rod and movable therewith, whereby adjustments may be made without moving or in any way disturbing the rod. The arrangement thus provides for the use of 'a' rod of porcelain or other neutral material,

and hence the thermostatic action resultsv entirely from the expansion and contraction of the rod-inclosing tube, thus avoiding'the necessity of delicate and extremely accurate adjustments between the valve and rod. The invention also includes improved means for rotating the valve for adjusting the mechanism to the temperature at which it is desired to maintain the water.

In the accompanying drawings, Figure 1 is a longitudinal sectional elevation of the improved valve mechanism, and Fig. 2 is a similar view taken in a plane at right angles to Fig. 1. Fig. 3 is a cross-section of the valve body taken on line 8-3 of Fig. 1. Figs. 4 and 5 are elevations of the opppsite sides of the cap-closed portion of the valve [)0 R eferring to the drawings, 2 designates the valve body having at opposite sides the gas inlet 3 and outlet 4, and located between the inlet and outlet is the usual valve seat 5. The outer side of body 2 opposite the seat is formed with the open annular extension 6, threaded internally as shown.

Projecting from the opposite side of the body" is the hollow extension 7, threaded at 7 for connecting with the wall of a stand boiler or other water container, not shown.

Secured to and adapted to project into thee, Specification of Lettersratent. fa ucauon matriarch 17;191e.- Serial No. 84,851.

Patented Sept. 3,.1918.

' tube- 8 of copper or other suitable metal which may be closed at its outer end by plug 9. Operative within tube 8 is the valveactuating. rod 10, which in thepreferred adaptation is formed of porcelain or other neutral or substantially neutral material.

The thermostatic tube and rod are arranged concentrically with valve seat 5 and disk valve 11 operative thereon, and the cavity 12 of body extension 7 is adapted to receive and form a guideway for the connecting head 13. Rod lO'extends into cavity 12, and head 13 is recessed at one end to embrace the rod as shown. Pins 14 project "from head 13 into the cavity ofl'setsfor grooves 12, whereby the head is prevented from rotating without interferingv with its longitudinal movement. An adjustable connection is provided between valve 11 and head 13, in the adaptation shown a threaded stem 15 projecting from the inner side of the valve and adjustably entered in threaded cavity 13 of head 13.

The open side of body 2 is adapted to be closed by the cap-like closure 16 having an annular extension 17 threaded externally to adjustably connect with the annular threaded body extension 6. A flat tang 18 pro jects from the outer side of the valve and is embraced by the wrench-forming lugs 19 at the inner side of cap 16. A coiled spring 20 encircles lugs 19 between the cap and valve for exerting seating pressure on the latter.

The flange-like skirt 21 of cap 16 embraces body extension 6, and at one side is notched at 22 for affording the cap limited movement relatively to the projecting stop 23. The opposite side of flange 21 is recessed at 21 and formed with the projecting pointer 25 which cooperates with graduations 26 on body extension 6 for indicating the temperature at which the valve is set to maintain the water. The valve body may be provided with the usual by-pass 27 around valve 11 and controlled by valve 28 for passing sufiicient gas to sustain a pilot-burner when valve 11 is closed. Also,-the inlet side of the valve body may be provided with the additional outlet 29, here shown closed by plug 29 for passing a pilot sustaining stream of gas around instead of through the 

